Seismic and aseismic slip on the Central Peru megathrust

Hugo Perfettini (), Jean-Philippe Avouac, Hernando Tavera, Andrew Kositsky, Jean-Mathieu Nocquet, Francis Bondoux, Mohamed Chlieh, Anthony Sladen, Laurence Audin, Daniel L. Farber and Pierre Soler
Additional contact information
Hugo Perfettini: Institut de Recherche pour le Développement, 44 Boulevard de Dunkerque, 13572 Marseille cedex 02, France
Jean-Philippe Avouac: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Hernando Tavera: Instituto Geofisico del Perú, Calle Badajos 169, Urb. Mayorazgo, Ate, Lima, Peru
Andrew Kositsky: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Jean-Mathieu Nocquet: GéoAzur, 250 Rue Albert Einstein, 06560 Valbonne, France
Francis Bondoux: Institut de Recherche pour le Développement, 44 Boulevard de Dunkerque, 13572 Marseille cedex 02, France
Mohamed Chlieh: Institut de Recherche pour le Développement, 44 Boulevard de Dunkerque, 13572 Marseille cedex 02, France
Anthony Sladen: Tectonics Observatory, California Institute of Technology, Pasadena, California 91125, USA
Laurence Audin: Institut de Recherche pour le Développement, 44 Boulevard de Dunkerque, 13572 Marseille cedex 02, France
Daniel L. Farber: University of California Santa Cruz, Santa Cruz, California 95064, USA
Pierre Soler: Institut de Recherche pour le Développement, 44 Boulevard de Dunkerque, 13572 Marseille cedex 02, France

Nature, 2010, vol. 465, issue 7294, 78-81

Abstract: Slip on the Peru megathrust Hugo Perfettini and colleagues show that the 2007 magnitude-8.0 Pisco earthquake in central Peru ruptured two asperities within a patch that had remained locked over the interseismic period, and triggered aseismic frictional afterslip on two adjacent patches. The most prominent patch of afterslip coincides with the subducting Nazca ridge, an area also characterized by a low interseismic coupling, which seems to have repeatedly acted as a barrier to seismic rupture propagation in the past. Aseismic slip accounts for as much as 50–70 per cent of the slip budget on the seismogenic portion of the megathrust in central Peru, and the return period of magnitude-8.0 earthquakes in the Pisco area is estimated to be 250 years.

Date: 2010
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DOI: 10.1038/nature09062

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